Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a2121937576274…

MALICIOUS

PDF

58.7 KB Created: 2021-06-10 17:54:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fb4c3b40c5cc15c00e0c71ea069075d6 SHA-1: 652f619e5d081fbb34d295429799abd4653bcf1b SHA-256: e7a212193757627463da451c0bf2ea1f295e2fd95c0e0669f658915e4de9f8ee
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and lures related to 'free Robux' and game hacks, indicating a social engineering attempt to trick users into visiting malicious sites. The heuristic firings confirm the presence of external URIs and a game hack redirect lure. While no scripts were directly extracted, the document's structure and embedded URLs suggest it acts as a dropper or redirector for further malicious activity, likely involving JavaScript execution on the target site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9717

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.tw/app/431946152/how-to-get-free-robux-on-discord-game-hack PDF link annotation
    • https://www.flexcable.com/images/free-robux-video-star-codes_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/roblox-why-are-there-no-free-clothes_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.flexcable.com/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/blox-best-robux_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/dowload-free-robux-hack-for-free_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-live_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • https://www.flexcable.com/images/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • https://www.flexcable.com/images/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000534d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x534D 36948 bytes
SHA-256: 05d384533cbcd46a9359bf8043b58c1363a43a2689ef6a06809f18b54a4b28eb
font_01_sfnt_off0000a5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5BB 8704 bytes
SHA-256: ddfd86c88a6b8304bc31eeb9f28c8110fac325cdacc87503bacf4ac741777490
font_02_sfnt_off0000c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 18744 bytes
SHA-256: 5a9271fa5fc7003dc1883cb62795950c49c1c62ac120b197d6de5cd638dbe571

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